The association of asthma duration with body mass index and Weight-Adjusted-Waist index in a nationwide study of the U.S. adults

Table 6 A subgroup analysis of the association between asthma duration and BMI (kg/m²)

Characteristics	Model 1 β, (95% CI)	Model 2 β, (95% CI)	Model 3 β, (95% CI)
Gender
Male	− 0.001 (− 0.014, 0.012)	− 0.012 (− 0.032, 0.008)	− 0.077 (− 0.097, − 0.058)
Female	− 0.006 (− 0.019, 0.007)	− 0.043 (− 0.061, − 0.025)	− 0.106 (− 0.124, − 0.087)
Stratified by age (years)
20–39	0.064 (0.012, 0.117)	0.313 (0.225, 0.400)	0.136 (0.054, 0.219)
40–59	− 0.055 (− 0.073, − 0.036)	− 0.069 (− 0.125, − 0.014)	− 0.202 (− 0.255, − 0.150)
60–80	0.014 (0.003, 0.025)	− 0.289 (− 0.326, − 0.251)	− 0.268 (− 0.305, − 0.232)
Race
White	− 0.017 (− 0.031, − 0.004)	− 0.031 (− 0.050, − 0.011)	− 0.108 (− 0.127, − 0.089)
Black	− 0.010 (− 0.030, 0.009)	− 0.029 (− 0.058, − 0.001)	− 0.120 (− 0.151, − 0.090)
Other races	0.010 (− 0.008, 0.028)	− 0.043 (− 0.070, − 0.017)	− 0.118 (− 0.146, − 0.090)
Stratified by asthma onset age (years)
< 12	− 0.096 (− 0.134, − 0.058)	− 0.076 (− 0.114, − 0.038)	− 0.071 (− 0.106, − 0.035)
12–39	0.024 (− 0.011, 0.059)	0.018 (− 0.016, 0.052)	0.026 (− 0.007, 0.059)
≥ 40	0.046 (− 0.055, 0.148)	0.034 (− 0.066, 0.133)	0.016 (− 0.076, 0.108)

Model 1 = no covariates were adjusted. Model 2 = Model 1 + gender, race were adjusted. Model 3 = Model 2 + asthma onset age, education level, PIR, smoking, alcohol, physical activity intensity, hypertension, diabetes, prescription medications, energy, sugars, fat, cholesterol, moisture were adjusted
^*In the subgroup analysis stratified by each covariate, the model is not adjusted for the stratification variable itself. PIR: Ratio of family income to poverty.

ISSN: 2047-783X